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When soldering, it's crucial to avoid letting the solder melt directly onto the iron for a few reasons:

1. Proper Heat Transfer: The goal is to heat the wires or components you're soldering, not the solder itself. By heating the wires, you ensure that the solder flows smoothly and creates a strong, reliable joint. If you melt the solder directly on the iron, it won't bond properly with the wires.

2. Cold Solder Joints: Melting solder directly on the iron can lead to "cold solder joints," which are weak and unreliable. These joints may look fine on the surface but can fail under stress or over time.

3. Oxidation and Contamination: The tip of the soldering iron can oxidize and become contaminated. When you melt solder directly on the iron, it can pick up these contaminants, leading to poor-quality joints.

Instead, heat the wires or components first, then touch the solder to the heated area. This ensures the solder melts and flows properly, creating a strong and durable connection.